33x10.50 vs 32x11.50 on Dana 35 with 3.07s - JeepForum.com

 
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post #1 of 10 Old 12-30-2013, 10:41 PM Thread Starter
notJoeKing
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33x10.50 vs 32x11.50 on Dana 35 with 3.07s

Need new tires and the tax refund should be here soon. About the same price and same mods needed to install either so I'm wondering which to choose and why. KM2 tires and an 02 TJ Sport if it helps. Not much into mud, water, or sand, strictly for rocks. The weight on the 2 are almost identical and the rim choice won't change. 15x8 alum with 3.75" BS.

Thanks in advance.

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post #2 of 10 Old 12-31-2013, 09:33 AM Thread Starter
notJoeKing
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Actually, I think I figured it out. I'm going with the 33s. They are 3 lbs lighter, $4 cheaper, offer more ground clearance, and do 20 less revolutions per mile than the 32s. Also I've wheeled a TJ on 33x12.50s before and I'm interested to see if having a longer contact patch, compared to a wider one, will help to keep me from getting stuck at certain points since more of the patch will be past that point before the center of the tire reaches it. Also, on an 8" rim, the 10.50 should offer a flatter tread profile than the 11.50

The 2 downsides of the 33 seem to be the reduced tread depth (18/32" vs 20/32") which I'm hoping evens out in the end given the flatter profile and the 20 less revolutions per mile (This is a daily driver). Also the increase likelihood of blowing a bead when aired down but, given that I will be babying the Dana 35, I think that won't be an issue either.

Thoughts? Obvious flaws in my thought process?
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post #3 of 10 Old 12-31-2013, 07:48 PM
jimk403
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I don't see a problem running larger tires on the 35, but 3.07 gears are probably not ideal.

Just my opinion, yours will differ.
Proud owner of: '09 Rubicon Unlimited, '90 XJ, '88 XJ, '77 J-10
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post #4 of 10 Old 12-31-2013, 08:33 PM
AntiPrius
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I have 33's and 3.07 gears and honestly, it's not bad at all around town. I also have the 3spd auto, but on the highway though, it doesn't turn enough rpm's to make passing power and I often have to use 2nd gear to pass and that is effectively like having 4.66 gears, and that would be too low for me. I think in my case, something like 4.10 would be ideal.
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post #5 of 10 Old 01-06-2014, 03:29 PM
JPGoody
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Quote:
Originally Posted by AntiPrius View Post
I have 33's and 3.07 gears and honestly, it's not bad at all around town. I also have the 3spd auto, but on the highway though, it doesn't turn enough rpm's to make passing power and I often have to use 2nd gear to pass and that is effectively like having 4.66 gears, and that would be too low for me. I think in my case, something like 4.10 would be ideal.
I have 3.07's w/5spd manual and am currently running 30" x 9.5" tires on 15x7 steelies and it is pretty bad most places here in CO.

I'm ready for tire replacement and I can't talk myself into a wee upgrade of 31s. I'm hoping by dropping ~8lbs w/Alum 15x7s I can keep out of 3rd gear on the hwy when going uphill.
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post #6 of 10 Old 01-06-2014, 08:35 PM
sunsetclb
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Quote:
Originally Posted by JPGoody View Post
I have 3.07's w/5spd manual and am currently running 30" x 9.5" tires on 15x7 steelies and it is pretty bad most places here in CO.

I'm ready for tire replacement and I can't talk myself into a wee upgrade of 31s. I'm hoping by dropping ~8lbs w/Alum 15x7s I can keep out of 3rd gear on the hwy when going uphill.
I can't believe its that bad..
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post #7 of 10 Old 01-06-2014, 09:22 PM
jimk403
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Originally Posted by sunsetclb View Post
I can't believe its that bad..
Believe it. The thin air up there really robs you of power.

Just my opinion, yours will differ.
Proud owner of: '09 Rubicon Unlimited, '90 XJ, '88 XJ, '77 J-10
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post #8 of 10 Old 01-08-2014, 05:52 PM
JPGoody
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Quote:
Originally Posted by sunsetclb View Post
I can't believe its that bad..
It ain't good!

I ran 32x11.50 MTRs on some surely real heavy chromed 15x8 rims years ago back in MI and it's a wee bit better than that here in CO with the 30"s. I never really used 5th in MI and herein CO I'm constantly in 4th nearly to the floor trying to keep her at a nice 63-66mph up to snowboarding country. The state hwy into elk camp country is 65mph and I can't achieve it for a few sections of the journey. Or I'm routinely slammed down into 3rd trying to gain a hwy-hill and usually tucked in behind a semi as I can't pass in several areas. No matter how hard I push her it takes me about 10 minutes more for the ~60 mile treck than it takes my friends in rangers, full size chevy 4x4, a grand prix and an accord. Coming down I can keep pace and use 5th, ha! An extra hour to Moab and almost 2 to Telluride. I got no beef about town, solid. I also notice it when attempting to "crawl" over rocks on trail rides, I tend to have to roll her into obstacles and that ain't good.

Again, steel wheels, elevation, uphill, heavier tires and the 3.07s is forcing me to stay in the 30x9.5 world, I mean it is 3 sizes up from what came on it from the factory. If dropping ~12lbs per tire/wheel is big improvement I may look to jump to a 31"


Holla!
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post #9 of 10 Old 01-09-2014, 09:57 AM
sunsetclb
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Well it sounds in your situation,you travel mtn highways mainly. You should regear .... No brainer
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post #10 of 10 Old 01-09-2014, 10:04 AM
sunsetclb
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Also, in reading threads on this forum.. The ones that complain the most about it are ones that live in mountainous locations. Now that's just a researching observation.
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